1,395 research outputs found
Possible relationships between solar activity and atmospheric constituents
The large body of data on solar variations and atmospheric constituents collected between 1902 and 1953 by the Astrophysical Observatory of the Smithsonian Institution (APO) was examined. Short-term variations in amounts of atmospheric aerosols and water vapor due to seasonal changes, volcanic activity, air pollution, and frontal activity are discussed. Preliminary evidence indicates that increased solar activity is at times associated with a decrease in attenuation due to airborne particulates
Spectral function of the Anderson impurity model at finite temperatures
Using the functional renormalization group (FRG) and the numerical
renormalization group (NRG), we calculate the spectral function of the Anderson
impurity model at zero and finite temperatures. In our FRG scheme spin
fluctuations are treated non-perturbatively via a suitable Hubbard-Stratonovich
field, but vertex corrections are neglected. A comparison with our highly
accurate NRG results shows that this FRG scheme gives a quantitatively good
description of the spectral line-shape at zero and finite temperatures both in
the weak and strong coupling regimes, although at zero temperature the FRG is
not able to reproduce the known exponential narrowing of the Kondo resonance at
strong coupling.Comment: 6 pages, 3 figures; new references adde
Theory of Optical Tweezers
We derive a partial-wave (Mie) expansion of the axial force exerted on a
transparent sphere by a laser beam focused through a high numerical aperture
objective. The results hold throughout the range of interest for practical
applications. The ray optics limit is shown to follow from the Mie expansion by
size averaging. Numerical plots show large deviations from ray optics near the
focal region and oscillatory behavior (explained in terms of a simple
interferometer picture) of the force as a function of the size parameter.
Available experimental data favor the present model over previous ones.Comment: 4 pages, 3 figure
The Sex-Selective Impact of the Black Death and Recurring Plagues in the Southern Netherlands, 1349-1450
Although recent work has begun to establish that early modern plagues had selective mortality effects, it was generally accepted that the initial outbreak of Black Death in 1347-52 was a ‘universal killer’. Recent bioarchaeological work, however, has argued that the Black Death was also selective with regard to age and pre-plague health status. The issue of the Black Death’s potential sex selectivity is less clear. Bioarchaeological research hypothesizes that sex-selection in mortality was possible during the initial Black Death outbreak, and we present evidence from historical sources to test this notion.Collective identities and transnational networks in medieval and early modern Europe, 1000-180
Ultrafast Deflection of Spatial Solitons in AlGaAs Slab Waveguides
We demonstrate ultrafast all-optical deflection of spatial solitons in an
AlGaAs slab waveguide using 190 fs, 1550 nm pulses which are used to generate
and deflect the spatial soliton. The steering beam is focused onto the top of
the waveguide near the soliton pathway and the soliton is steered due to
refractive index changes induced by optical Kerr, or free carrier (Drude)
effects. Angular deflections up to 8 mR are observed.Comment: accept. for publ. in Optics Letter
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